Hi Salvatore,
Please ensure that your app is doing something along the following lines:
private List<OcResource> mListOfFoundResources = new LinkedList<>();
@Override
public synchronized void onResourceFound(OcResource ocResource) {
// the following line prevents an object referenced by the ocResource
// from being destroyed after the completion of onResourceFound method
mListOfFoundResources.add(ocResource);
try {
ocResource.get(new HashMap<String, String>(), this);
...
If you didn't find this example useful, please provide the code to replicate
the issue.
Thanks,
Tim Kourt
Intel Open Source Technology Center
-----Original Message-----
From: salvatore.iovene at gmail.com [mailto:salvatore.iov...@gmail.com] On
Behalf Of Salvatore Iovene
Sent: Wednesday, February 3, 2016 11:24 PM
To: Kourt, Tim A <tim.a.kourt at intel.com>
Cc: iotivity-dev at lists.iotivity.org
Subject: Re: [dev] Crash when JNI layer removes OnGetEventListener
Hi Tim,
"someResource" going out of scope and getting GC-ed was exactly what I thought
would be the case, but I made sure that it isn't. I tried making my
OcResource.OnGetListener an object that I know for sure is not going out of
scope, and the issue is still presenting itself. Even forced my program to wait
until onGetCompleted was executed (using a flag and a while loop with a
Thread.sleep) but it's still happening.
Any other suggestions please?
On Wed, Feb 3, 2016 at 9:37 PM, Kourt, Tim A <tim.a.kourt at intel.com> wrote:
> Hi Salvatore,
>
> The sleep command is there for the log readability purposes only and should
> not be used in a real life application.
>
> The symptoms that you described are likely caused by the resource object
> (someResource) going out of scope and GC-ed sometime later. Keeping a global
> reference to the resource should help.
>
> Tim Kourt
> Intel Open Source Technology Center
>
>
> -----Original Message-----
> From: iotivity-dev-bounces at lists.iotivity.org
> [mailto:iotivity-dev-bounces at lists.iotivity.org] On Behalf Of
> Salvatore Iovene
> Sent: Wednesday, February 3, 2016 11:12 AM
> To: iotivity-dev at lists.iotivity.org
> Subject: [dev] Crash when JNI layer removes OnGetEventListener
>
>
>> On 03 Feb 2016, at 14:06, Salvatore Iovene <salvatore at iovene.com> wrote:
>>
>> Hi,
>> I?m working on a project on top of the Iotivity Java API, and when I try do
>> the following, the Iotivity stack crashes:
>>
>> someResource.get(new HashMap<String, String>(), this);
>>
>> Here?s the backtrack but it?s probably not very useful.
>>
>> I/DEBUG ( 2763): pid: 19871, tid: 19928, name: JavaBridge >>>
>> com.example.CordovaPluginOicDemo <<<
>> I/DEBUG ( 2763): signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr
>> --------
>> I/DEBUG ( 2763): eax 00000000 ebx 00004d9f ecx 00004dd8 edx 00000006
>> I/DEBUG ( 2763): esi db11edb8 edi 00000000
>> I/DEBUG ( 2763): xcs 00000023 xds 0000002b xes 0000002b xfs
>> 00000117 xss 0000002b
>> I/DEBUG ( 2763): eip f772aec6 ebp 00004dd8 esp db11ec00 flags
>> 00200206
>> I/DEBUG ( 2763):
>> I/DEBUG ( 2763): backtrace:
>> I/DEBUG ( 2763): #00 pc 00085ec6 /system/lib/libc.so (tgkill+22)
>> I/DEBUG ( 2763): #01 pc 00031223 /system/lib/libc.so
>> (pthread_kill+163)
>> I/DEBUG ( 2763): #02 pc 00032af5 /system/lib/libc.so (raise+37)
>> I/DEBUG ( 2763): #03 pc 0002ac75 /system/lib/libc.so (abort+85)
>> I/DEBUG ( 2763): #04 pc 00050934
>> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so
>> (__gnu_cxx::__verbose_terminate_handler()+452)
>> I/DEBUG ( 2763): #05 pc 0004e3f7
>> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so
>> (__cxxabiv1::__terminate(void (*)())+23)
>> I/DEBUG ( 2763): #06 pc 0004e48f
>> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so
>> (std::terminate()+31)
>> I/DEBUG ( 2763): #07 pc 000bcdfd
>> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so
>> (execute_native_thread_routine+141)
>> I/DEBUG ( 2763): #08 pc 000301f9 /system/lib/libc.so
>> (__pthread_start(void*)+57)
>> I/DEBUG ( 2763): #09 pc 0002b3da /system/lib/libc.so
>> (__start_thread+26)
>> I/DEBUG ( 2763): #10 pc 00012c56 /system/lib/libc.so
>> (__bionic_clone+70)
>>
>>
>> However, it looks like a threading problem, and I looked at
>> /android/examples/simpleclient/?/SimpleClient.java and right before calling
>> ?get? on a resource, it does ?sleep(1)?.
>>
>> Might the two things be related? ?sleep(1)? just doesn?t sound right? can
>> anyone explain what?s going on and how to address it properly?
>
> Hi again,
> I?ve done some more experimenting, and I?ve come to the conclusion that the
> stack is systematically crashing when the JNI layer removes the OnGetListener.
>
> This can always be seen in my logs before the crash:
>
> D/OIC-JNI ( 8643): ~JniOnGetListener
> I/OIC-JNI ( 8643): OnEventListener is removed
>
> Unfortunately there are no more debug logs in that Java file, but given the
> fact that the backtrace mentions ?pthread_kill?, maybe this is related to
> g_jvm->DetachCurrentThread()?
>
> I?m using the Iotivity Java stack in a Cordova plugin for Android, if it
> helps.
>
> Please let me know if you can help!
> Thanks!
> Salvatore
>
> _______________________________________________
> iotivity-dev mailing list
> iotivity-dev at lists.iotivity.org
> https://lists.iotivity.org/mailman/listinfo/iotivity-dev
--
Salvatore Iovene
Personal website: http://iovene.com/
Founder of AstroBin: http://astrobin.com/
